Wagon-brake lock



(NoModelJ) s. s. HURL'B-UT.

.WAGON BRAKE LOGK.

Patented July 4, 1882.

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UNITED STATES PATENT OFFICE.

SIDNEY S. HURLBUI, OF RACINE, VISGONSIN.

WAGON-BRAKE LooK.

SPECIFICATION forming part of Letters Patent No. 260,573, dated July 4, 1882. `Application led December 19x 1881. (No model.)

To all whom it may concern.-

Be it known that I, SIDNEY S. HURLBUT,v

. ication.

This invention relates to automatic gravitylocks for wagon-brakes, and has for its object to provide a construction in such locks that will be more simple, cheap, and durable than locks heretofore made, and adapted to operate without a spring.

To this end it consists in the combination, with a curved rack having notches on its upper face, with the brake-lever, and with a suitable pawl-lifting device, of a pawl-block con-` structed to slide longitudinally upon the brakelever and to embrace said lever and rack, so as to retain these parts while being itself retained in proper relative position, and lprovided with a. depending projection which engages the rack-notches. y

It further consists in certain features of construction hereinafter explained and claimed.

In the accompanying drawings, Figure 1 is a perspective ofthe lock as the same appears when secured to the vertical side of a wagon-4 box. Fig. 2 is a lvertical section through the lever when upright. Fig. 3 is a central vertical section of the sliding pawl-block detached and enlarged. Fig. 4 is a rear view of the pawl-block detached and enlarged.

A is a rack curved in thearc of circle from the point b, which rack sets out a short distance from the side-board 'X ot a wagon-box to give free passage to the lever L behind it, being supported by short standards at ct and c in the usual manner of constructing such racks, and provided with notches u n 011 its upper edge.

B is an arm preferably.A cast in the same piece with A, with an offset at a, so as to lie rlat upon the side-board X. At its lower end the arm Bis cast with an offset, b, which, when the frame is applied to the wagon, gives a recess or socket, open at the top, to receive the lower end of the lever L. The pivotbolt b passes through the oiset, through the lever, and through the box'X, as shown plainly in Fig. 2. Said lever L is a ilat iron bar of uniform widthat least in the neighborhood ot' the rack A-extending to the usual height.

L is the brake-rod.

D is a pawl block of peculiar construction, being formed to pass at its central part outside the rack A and at its ends to extend inward and behind the lever L, said lever passing through rectangularapertures d. The pawl- Vblock thus holds the rack A and lever L in proper relation, as shown. 0n its inner face the pawl-block D is provided with the depending annular projection d, adapted to engage the notches n ofthe rack. 'The block is fitted to freely slide longitudinally upon the lever L and forward and backward over the rack A, sufficient space being provided between its inwardly-directed ends to allow the block to rise and fall, so that the projection d may clear the notches a a.

E is a short pawl-lever, arranged in front of the lever L, and pivoted at c near .the top of said lever L. It is connected by its short arm with the Apawl-block D by the small rod E.

When it is desired to lock the brake thelever L is pushed forward in the usual manner, and the block D, by its gravity, augmented in some degree by that of the pawllever E and the connecting rod E', causes the projection d to engage with the notches u. To release the brake, the pawl lever E is drawn backward, which lifts the pawl-block and directly draws the projection d from the engaging-notches.

The novelty of the construction described consists principally in the arrangement, with the lever and rack, of the sliding pawl D, operating by gravity alone, and so formed as to embrace both the single rack and the lever to retain these parts in proper'relative position.

The pawl-block bein gcast in form, the attachment ofthe rivet e and the rod E substantially comprises the hand-labor required in putting up the lock'. In order that this work may be done without handling more than the parts thus connected-namely, the lever L, the pawl, and the pawl-lever-t-he standard, at a, is pret'- erably a separate piece from the rack A, so that said rack may be slid through the pawl- IOO block ai'ter the latter is connected with the lever L.

l am aware that gravity pawls in Wagoir brake locks are old, and therefore do not claim this feature independently of other features of construction and arrangement distinctlypointed out and shown.

I claim as my invention- 1. Combined with thc lever L and rack A, having` notches n upon its upper edge, a sliding pawLblock, D, adapted to embrace the rack and lever, and provided with the depending projection d and the lifting-lever E, together arranged and operating substantially as dcscribed.

2. Combined with the lever L and rack A,

SIDNEY S. HUIULBUT.

Witnesses:

J oHN ARMSTRONG, H. W. HURLBUT. 

